The "deChannel" channel header contains the following information on the extracted channels. One row is assigned to each channel.

_FileID

Unique internal ID assigned to each dataset

_ChannelNr

Unique internal channel ID assigned to the extracted signal

_Name

Name of the extracted signal

_Unit

Physical unit of the extracted signal

_IsDigital

This flag is set when the signal is "logical".

_Interval

Storage interval of the extracted data, see Archive profile assignment

_IsTimeInterval

This flag is set for timebased datasets.

_Segments

This column contains compressed data, which is extracted as BLOBs (binary large objects) if the corresponding option is selected for extraction, see Using BLOBs.

The "deChannel" is displayed in the database as shown in the following figures.

Without BLOBs:

With BLOBs:

For vector signals, the _LogicalID column is created additionally.